Nick...

This may sound remote but there's something to it. Look at the location of each of the other 3 stores. What side of the street are they on? I live on the east side of Los Angeles and virtually every single Starbucks from my house through Pasadena is on the north side of the street. This means they own the morning traffic going into Pas or Glendale/Burbank or LA. I suspect they've determined that people won't cross traffic to stop for coffee in the morning and those that go there in the evening aren't fighting that type of rush hour traffic so it doesn't matter. Location is everything.
Good luck
Denny